bell movement behaviour

src/main/java/com/simibubi/create/AllMovementBehaviours.java

@@ -1,8 +1,10 @@
 package com.simibubi.create;
 
+import com.simibubi.create.content.contraptions.components.actors.BellMovementBehaviour;
 import com.simibubi.create.content.contraptions.components.structureMovement.MovementBehaviour;
 import com.tterrag.registrate.util.nullness.NonNullConsumer;
 import net.minecraft.block.Block;
+import net.minecraft.block.Blocks;
 import net.minecraft.util.ResourceLocation;
 
 import javax.annotation.Nullable;
@@ -34,5 +36,7 @@ public class AllMovementBehaviours {
 		return b -> addMovementBehaviour(b.getRegistryName(), movementBehaviour);
 	}
 
-	static void register() {}
+	static void register() {
+		addMovementBehaviour(Blocks.BELL.getRegistryName(), new BellMovementBehaviour());
+	}
 }

src/main/java/com/simibubi/create/content/contraptions/components/actors/BellMovementBehaviour.java

@@ -0,0 +1,32 @@
+package com.simibubi.create.content.contraptions.components.actors;
+
+import com.simibubi.create.content.contraptions.components.structureMovement.MovementBehaviour;
+import com.simibubi.create.content.contraptions.components.structureMovement.MovementContext;
+
+import net.minecraft.util.SoundCategory;
+import net.minecraft.util.SoundEvents;
+import net.minecraft.util.math.BlockPos;
+import net.minecraft.util.math.Vec3d;
+
+public class BellMovementBehaviour extends MovementBehaviour {
+	@Override
+	public boolean hasSpecialMovementRenderer() {
+		return false;
+	}
+
+	@Override
+	public void onSpeedChanged(MovementContext context, Vec3d oldMotion, Vec3d motion) {
+		double dotProduct = oldMotion.dotProduct(motion);
+
+		if (dotProduct <= 0 && (context.relativeMotion.length() != 0 || context.rotation.length() == 0)
+			|| context.firstMovement)
+			context.world.playSound(null, new BlockPos(context.position), SoundEvents.BLOCK_BELL_USE,
+				SoundCategory.BLOCKS, 2.0F, 1.0F);
+	}
+
+	@Override
+	public void stopMoving(MovementContext context) {
+		context.world.playSound(null, new BlockPos(context.position), SoundEvents.BLOCK_BELL_USE, SoundCategory.BLOCKS,
+			2.0F, 1.0F);
+	}
+}

src/main/java/com/simibubi/create/content/contraptions/components/structureMovement/Contraption.java

@@ -464,7 +464,8 @@ public abstract class Contraption {
 					else
 						renderOrder.add(0, info.pos);
 					CompoundNBT tag = info.nbt;
-					if (tag == null || AllMovementBehaviours.hasMovementBehaviour(block))
+					MovementBehaviour movementBehaviour = AllMovementBehaviours.getMovementBehaviour(block);
+					if (tag == null || movementBehaviour == null || movementBehaviour.hasSpecialMovementRenderer())
 						return;
 
 					tag.putInt("x", info.pos.getX());
@@ -472,6 +473,8 @@ public abstract class Contraption {
 					tag.putInt("z", info.pos.getZ());
 
 					TileEntity te = TileEntity.create(tag);
+					if (te == null)
+						return;
 					te.setLocation(new WrappedWorld(world) {
 
 						@Override

src/main/java/com/simibubi/create/content/contraptions/components/structureMovement/ContraptionEntity.java

@@ -459,6 +459,7 @@ public class ContraptionEntity extends Entity implements IEntityAdditionalSpawnD
 
 			boolean newPosVisited = false;
 			BlockPos gridPosition = new BlockPos(actorPosition);
+			Vec3d oldMotion = context.motion;
 
 			if (!context.stall) {
 				Vec3d previousPosition = context.position;
@@ -500,6 +501,8 @@ public class ContraptionEntity extends Entity implements IEntityAdditionalSpawnD
 					actor.visitNewPosition(context, gridPosition);
 					context.firstMovement = false;
 				}
+				if (!oldMotion.equals(context.motion))
+					actor.onSpeedChanged(context, oldMotion, context.motion);
 				actor.tick(context);
 				contraption.stalled |= context.stall;
 			}

src/main/java/com/simibubi/create/content/contraptions/components/structureMovement/ContraptionRenderer.java

@@ -109,8 +109,9 @@ public class ContraptionRenderer {
 					.translate(blockInfo.pos);
 			}
 
-			Contraption.getMovement(blockInfo.state)
+			MovementBehaviour movementBehaviour = Contraption.getMovement(blockInfo.state);
-				.renderInContraption(context, ms, msLocal, buffer);
+			if (movementBehaviour != null)
+				movementBehaviour.renderInContraption(context, ms, msLocal, buffer);
 
 			for (MatrixStack m : matrixStacks)
 				m.pop();

src/main/java/com/simibubi/create/content/contraptions/components/structureMovement/MovementBehaviour.java

@@ -47,8 +47,15 @@ public abstract class MovementBehaviour {
 
 	}
 
+	public boolean hasSpecialMovementRenderer() {
+		return true;
+	}
+
 	@OnlyIn(Dist.CLIENT)
 	public void renderInContraption(MovementContext context, MatrixStack ms, MatrixStack msLocal,
 		IRenderTypeBuffer buffer) {}
 
+	public void onSpeedChanged(MovementContext context, Vec3d oldMotion, Vec3d motion) {
+
+	}
 }